New autopilot features are demonstrated in a Tesla Model S during a Tesla event in Palo Alto, Calif., Wednesday. Beck Diefenbach/Reuters/Landov hide caption

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Tesla CEO Elon Musk speaks during an event in Fremont, Calif., to launch the new Tesla Model X Crossover SUV. Justin Sullivan/Getty Images hide caption

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Hackers say they took control of a Tesla Model S through the car's computers. Tesla Motors says it is updating its systems with a patch to fix the vulnerability. Tesla Motors hide caption

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A photo released by Tesla shows its new Powerwall lithium-ion battery pack mounted on the wall (left) of a garage behind one of the company's electric cars. Tesla Energy hide caption

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The Two-Way

Tesla CEO Elon Musk Unveils Home Battery; Is $3,000 Cheap Enough?

With a sleek surface and a depth of only about 7 inches, the Powerwall can be mounted on a garage wall or another surface, indoors or outside.

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Tesla Motors has outsold several luxury carmakers in California in 2013, on the strength of its Model S, seen here in the foreground. The Telsa Roadster is behind it. James Lipman/Telsa hide caption

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Elon Musk's "Hyperloop" vehicle. Elon Musk hide caption

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A Tesla Model S drives outside the Tesla factory in Fremont, Calif., on June 22. The electric car was named Automobile of the Year by Automobile Magazine and Car of the Year by Motor Trend. Paul Sakuma/AP hide caption

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